KABUL (Agencies) - Iran's ban on fuel tankers crossing into Afghanistan over accusations that they are supplying Nato troops is snaring ordinary Afghans, experts say. Some 2,000 trucks are stranded on the Iranian-Afghan border, Afghanistan's commerce ministry says, in a standoff which has run since early December, heaping more misery on civilians in the war-torn, impoverished country. Behind it all is Iran's desire to strike out at the international community over its nuclear weapons programme and at Afghanistan over efforts to make peace with the Taliban, according to some analysts. "Isaf and Nato do not receive any fuel shipments through Iran, so operationally the blockade does not impact Isaf," said spokeswoman for the Nato-led International Security Assistance Force (Isaf) Major Sunset Belinsky. With the blockade, the ordinary Afghans who, with the first snows of winter recently falling in the capital Kabul, face paying 40 percent more for fuel, plus extra for other day-to-day essentials. Afghan fuel protesters targeted an Iranian diplomatic mission for a second day on Sunday, as the commerce minister said Tehran had not given any reason for an export clampdown that is choking Afghan oil supplies. Around 300 people took to the streets in western Herat city, armed with stones and eggs, and marched to the Iranian consulate carrying banners with slogans including "Death to Iran". At a border crossing barely 100 km away nearly 2,000 fuel trunks are waiting. Only 40 are allowed to leave Iran each day, said Afghan Commerce Minister Anwar ul-Haq Ahadi. "The stoppage of fuel tankers has created great problems and a crisis for us in terms of fuel supply," Ahadi said, adding that around 40 percent of the landlocked country's fuel usually comes from Iran. Afghanistan is suffering after several weeks cut off from a major supply route. "The Iranian authorities have assured us the issue is being solved but unfortunately the crisis is where it was," Ahadi told a news conference in the capital Kabul. Fuel prices have gone up around the country, in some areas by as much as 35 percent, the Afghan Chamber of Commerce and Industries said earlier this week. Provinces bordering Iran have seen the most dramatic increase. Kabul has asked Kazakhstan to sell Afghanistan some 200,000 tons of fuel immediately, and private sector deals have been made with a Russian oil firm, Ahadi said. "We are unhappy about the progress of our negotiation with Iranian authorities in regard to tackling the crisis," he said. "We have not yet heard any convincing justifications from Iranian authorities (for the blockage)." Iran has rejected Afghan criticism, saying the slowdown was due to "technical problems" related to the reduction of Iranian fuel subsidies and that the issue was now being solved. Demonstrations earlier in the week in Kabul about both fuel prices and the deaths of Afghans in Iran prompted Tehran to call in the Afghan ambassador in protest. Political analysts say relations between Afghanistan and Iran would also likely be affected by the situation. Expert Razaq Mamoon said that Iran's blockade could seriously harm relations between the Islamic "brothers", highlighted in October when Karzai admitted receiving regular cash payments from Tehran.